(19)
(11) EP 0 473 092 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
01.04.1992 Bulletin 1992/14

(43) Date of publication A2:
04.03.1992 Bulletin 1992/10

(21) Application number: 91114263.6

(22) Date of filing: 26.08.1991
(51) International Patent Classification (IPC)5: G11B 5/127, G11B 5/187
(84) Designated Contracting States:
DE FR GB

(30) Priority: 31.08.1990 JP 231676/90

(71) Applicant: SANYO ELECTRIC CO., LTD.
Moriguchi-shi, Osaka (JP)

(72) Inventors:
  • Ogawa, Takahiro
    Sennan-gun, Osaka-fu (JP)
  • Inoue, Atsushi
    Yao-shi, Osaka-fu (JP)
  • Koga, Kazuhiko
    Daito-shi, Osaka-fu (JP)
  • Ito, Kiyotaka
    Daito-shi, Osaka-fu (JP)
  • Ueta, Yutaka
    Yao-shi, Osaka-fu (JP)

(74) Representative: Glawe, Delfs, Moll & Partner 
Patentanwälte Postfach 26 01 62
80058 München
80058 München (DE)


(56) References cited: : 
   
       


    (54) Method of manufacturing floating type magnetic head


    (57) A floating type composite magnetic head includes a head core (39) fixed to a slider (19) formed of nonmagnetic material. In the head core (39), a pair of magnetic core halves are abutted against each other with nonmagnetic material such as SiO₂ or the like interposed therebetween. The first and second magnetic core half members (22a and 22b) have first and second gap forming surfaces to be abutted against each other to define a magnetic gap (g), respectively. A first groove (23, 24) is formed on the second gap forming surface. A glass layer (25) is formed in the first groove (23, 24). A first thin film (30a) including a ferromagnetic metal thin film (27) is selectively formed on the first gap forming surface. A second thin film (30b) including a ferromagnetic metal thin film (32) is selectively formed on the second gap forming surface so that at least a portion except the surface of the glass layer (25) in the second gap forming surface is exposed. A second groove (35) is formed on the exposed second gap forming surface adjacent to the first groove (23, 24). The first and second magnetic core half members (22a and 22b) are abutted and bonded with glass so that the first and second gap forming surfaces face each other so that the first and second thin films (30a and 30b) are abutted with SiO₂ or the like interposed therebetween to define a magnetic gap (g). Causes of occurrence and an increase of false gaps are suppressed and a decrease in manufacturing yield due to separation of thin films or the like can be prevented.






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